What was the SIZE of the Green Hummingbird-like bird you saw in Wyoming?

Rivoli's Hummingbird: Large hummingbird of Mexican highlands, occurs in limited areas of southwest U.S. Appears very dark green overall, in good light may show blue-green to green throat, purple forehead, gray vent, small but prominent white spot behind eye; tail is all dark. Black legs, feet.
Rivoli's Hummingbird is a new name for the Magnificent Hummingbird. It was split into Rivoli's and Talamanca Hummingbird, the latter is found in the cloudforests of Costa Rica and western Panama.